Nonlinear optical properties and photoinduced anisotropy of an azobenzene ionic liquid–crystalline polymer

Nonlinear and thermo-optical characterisation of bare imidazolium ionic liquids

“…Because of their negligible vaopur pressure, these fluids are using as a working media under ultra vacuum conditions (10-9 mbar), and can expose them to an electron and/or ion beam without the charging effect [3,4]. Si (100) anchored imidazolium ILs derived microstructures that represented light transmission properties and acted as photonic elements for near-infrared [5,6].…”

“…Several studies were performed in IL yet. Nonlinear refractive indexes by the Z-scan technique were studied and characterized for BMI.BF4 with colloidal solution of silver nanoparticles dispersed in [3] , mixtures of azobenzene containing ILs crystalline polymer [4] and thin film of IL crystalline polymer [5]. The range of thermal response is bigger since this response is typically much stronger than the refractive.…”

“…We can classify the effects measured by these techniques into two main groups: the nonlinear refractive/electronic response, also called a local or fast response, generated by the nonlinear refractive index excitation; and the thermal response, named nonlocal or slow response, caused by the sample heating. Nonlinear refractive indexes by the Z-scan technique have already been studied and characterised for BMI.BF 4 with colloidal solution of silver nanoparticles dispersed in [18] mixtures of azobenzene containing ILs crystalline polymer [11] and a thin film of IL crystalline polymer [19]. In the case of bare liquids, even for non-resonant excitation, the amplitude of the thermal response is typically much stronger than the refractive one.…”